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RENAMING DECIMALS ON THE LINEAR ABACUS®

DAY 16

Expanding decimal numbers using base 10 groups 

Key Mathematical Ideas

  • ​Represent decimals as a bead in a sequence using the Linear Abacus®.

  • Expand decimal numbers additively using base 10 groups.

  • Use the Linear Abacus® to visualise different expansions of the same decimal number. 

  • Rename decimals using equivalent representations on the abacus string. 

Exploration

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Expand the decimal number 2.45 on your Linear Abacus® in at least two different ways.  How are you thinking about this number additively? Show how your arithmetic descriptions are equivalent. 

 

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Share their creative thinking on our Mathematics Community Forum

Support

Encourage children to describe their number in terms of how many groups of tenths and hundredths. Then remind them about equivalent representations e.g., 10-hundredths make 1-tenth.  

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Extension

Challenge students to explain how two arithmetic descriptions and models are equivalent.

Micro Writing Task

Complete day 16 of your journal. For parents and teachers this prompt encourages children to collect examples to show how algorithms and formulas are applied. If there are errors in the child's work, have them rework mistakes and make meaning of these processes. 

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